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Unexplaned reboots

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when im happily working away on my pc (doesnt happen too often) my computer will cut out and reboot for no reason, it doesnt shut itself down properly, it just cuts out and reboots, rather annoying! i've checked my hard drive using 'seatools' and i've checked all the power connections but i cant find a solution, anyone got any ideas?

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Make sure your motherboard is properly seated to ensure that nothing is shorting out and causing reboot.

Do a fully updated spyware scan with Ad-Aware SE and Spybot S&D, as well as anti-virus scan with a trial version of Kaspersky and/or NOD32. It is possible you have a trojan horse that is sending a reboot command.

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I had an issue similar to this and mine turned out to be the hard drive itself. I had tested it numerous times with diagnostics software and it always passed. After changing every other component, I tried an old hard drive. It has worked fine ever since.

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I had an issue similar to this and mine turned out to be the hard drive itself. I had tested it numerous times with diagnostics software and it always passed. After changing every other component, I tried an old hard drive. It has worked fine ever since.

With a few hundred hours troubleshooting just such problems, I'd have to concur that it's most likely a hardware problem.

There is an undocumented keyboard sequence on some computers, that will cause windows to do a crash shutdown.

I had that once myself.

Also any bad keyboard or mouse will do it too. Those are usually easy enough to replace, for troubleshooting purposes anyway.